Attenuation To Crosstalk Ratio

The Attenuation To Crosstalk Ratio ( ACR short; German Crosstalk attenuation) is the ratio of NEXT (Near End Crosstalk ) and cable attenuation in dB (ACR = NEXT (dB ) - cable attenuation (dB ) ).

The ACR value expresses the quality of a cable. The higher the value, the higher is the quality of the cable ( with respect to the frequency).

Example: For a unshielded twisted pair cable, the cable attenuation is 19 dB and the NEXT value 82 dB. This results in that the ACR 63 dB (82 dB - 19 dB ) is. Another UTP cable has an ACR of 50 dB, that is, that this cable in comparison with the first-mentioned cable line quality is inferior since the ACR value is lower.

With simultaneous transmission of a signal to divide in several pairs of wires must be noted that the pair - to-pair ACR must be at least 3 dB at 200 MHz.

The ACR is similar to the noise ratio of the telephony or any other transmission technology. For the ( digital ) communications technology must be ensured that the ACR within the bandwidth to be transmitted is not less than 0.